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Change tidb_memory_usage_alarm_ratio scope to instance #6409

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merged 3 commits into from
Jul 6, 2021
Merged

Change tidb_memory_usage_alarm_ratio scope to instance #6409

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4130c5b
change tidb_memory_usage_alarm_ratio to instance scope
wshwsh12 Jun 4, 2021
e753e2d
Merge branch 'master' into memery-alarm
TomShawn Jul 5, 2021
bf820a1
Update system-variables.md
TomShawn Jul 6, 2021
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5 changes: 3 additions & 2 deletions system-variables.md
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Expand Up @@ -922,8 +922,9 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）

### `tidb_memory_usage_alarm_ratio`

- 作用域：SESSION
- 默认值：`0.8`
- 作用域：`INSTANCE`
- 默认值：0.8

- TiDB 内存使用占总内存的比例超过一定阈值时会报警。该功能的详细介绍和使用方法可以参考 [`memory-usage-alarm-ratio`](/tidb-configuration-file.md#memory-usage-alarm-ratio-从-v409-版本开始引入)。
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- 该变量的初始值可通过 [`memory-usage-alarm-ratio`](/tidb-configuration-file.md#memory-usage-alarm-ratio-从-v409-版本开始引入) 进行配置。

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